Xiaomi Redmi 4 is one of the most popular budget smartphones of 2016-2017, but even after 5-7 years of operation, the battery loses up to 70% of its capacity. If your device discharges in a couple of hours, turns off at 30-40% charge or the case is swollen, it’s time to change the battery. In the service center for this procedure will take 1,500-3000 ₽, But with the tools and patience, you can do it yourself in 30-40 minutes.
In this article, we provide detailed instructions on how to replace your battery with Redmi 4 (including Pro and Prime versions), taking into account typical beginner errors: how to choose a quality battery, what tools you will need, how to carefully disassemble the phone and not damage the plumes, and what to do if the smartphone does not turn on or quickly discharges after replacing.
⚠️ Important: if the battery is swelling (the body is deformed, the screen "steps" from the frame), do not delay the replacement. Lithium-ion batteries in this state can ignite or damage the motherboard. If you have severe deformation, do not try to remove the battery yourself - contact the service.
How to understand that the battery Xiaomi Redmi 4 is time to change: 5 obvious signs
The average battery life of a smartphone is 3-4 years (500-800 charge cycles). Redmi 4 with its 4100 mAh battery, the first signs of wear and tear may appear after 2 years of active use.
- 🔋 Instant charge drop: the phone turns off at 20 to 30 percent or sinks from 50 to 1 percent in a few minutes, which indicates a loss of capacity and unstable controller operation.
- ⚡ The charging time has increased: if the battery was charged in 2 hours, and now it requires 4 hours+ — It's a sign of cell degradation.
- 🔥 Overheating during charging or playing: A worn-out battery heats up more than a new one, sometimes up to 50-60°C (can be checked through applications such as AIDA64).
- 📱 Bloating: If the back cover or screen “go away” and the sides are visible gaps – the battery has physically increased in size.
- ⚠️ System errors: notifications “Battery damaged” or “Charge suspended” (Settings) → Battery status).
💡 How do you check the wear and tear software? Install the AccuBattery app (free on Google Play) that shows the actual battery capacity and wear, and if it's below 2,500-3,000 mAh (at the initial 4100 mAh), it's time to change.
2. Which battery to choose for Xiaomi Redmi 4: original vs analogues
Original Batteries for Redmi 4 (Article) MB-J10) They're not made anymore, but there are quality analogues on the market, and the main thing is not to run into a fake with a capacity 2 times lower than the declared one:
| Criteria | Original (b/y or residues) | Quality analogue | Cheap fake |
|---|---|---|---|
| Capacity | 4100 mAh | 4000-4200 mAh (tolerable deviation) | 2000–3,000 mAh (deception) |
| Manufacturer | ATL (Amperex Technology Limited) | ATL, Samsung SDI, Lishen | Without a logo or an unknown brand |
| Charge controller | Built-in (original chip) | Built-in (similar to the original) | Absent or simplified |
| Price (2026) | 2 000–3 500 ₽ (b) | 800–1 500 ₽ | 300–600 ₽ |
| Where to buy | eBay, service centers | AliExpress (shops with a rating of 98%+), I'll take it, Yandex Market. | Doubtful websites, street trays |
🔍 How to distinguish a qualitative analogue?
- 📦 Packaging: should be with a hologram, an article and a production date.
- 🔧 Weight: The original weighs ~45–50 A.D. Counterfeiting is often easier (30–40 g) due to fewer active elements.
- 📏 Size: exact match with the original (146 × 70 × 3,5 Even millimeter deviation can lead to assembly problems.
⚠️ Note: If you buy a battery on AliExpress, pay attention to the reviews with photos. Often sellers send batteries with a capacity of 2000 mAh, although the description says 4100 mAh!
🛒 Recommended Stores (2026):
- AliExpress: Official Xiaomi Store, HQ Battery Store.
- Yandex Market: stores with a rating above 4.8 and reviews about the inspection of capacity.
- Offline: service centers, verified radio market points (ask for a 3-6 month warranty).
💡
Before buying, ask the seller to send a photo of the battery with a multimeter showing the voltage. The norm for a new battery is 3.7-4.2 V. If less than 3.5 V, it is used or a marriage.
3. Battery replacement tools: what you will need
To disassemble Xiaomi Redmi 4 does not need professional tools, but do not do without them.
- 🔧 Plastic blades (mediators) - 2-3 pcs. for putting the cover and disconnecting the plumes.
- ⚒️ Cross screwdriver (PH00 or PH0) — hull-rotor.
- 🔥 Dryer or thermo-air station - for softening the glue under the battery (temperature 60-80)°C).
- 🧲 Magnetic mat or container – so as not to lose the screws (their) ~15!).
- 🩹 Isopolenta or double-sided scotch - for fixing a new battery.
- 🔌 Multimeter (optional) – to check the voltage on the contacts.
- 🧴 Alcohol (isopropyl) or solvent - to remove glue residues.
💰 Cost of the set: if you buy everything from scratch, it will come to ~1 000–1 500 ₽. But most tools are also useful for other repairs (such as screen replacements or speakers).
⚠️ Warning: don't use metal blades or knives to tamper with the battery! The risk of damaging or puncturing it is too high. Only plastic or nylon mediators.
Charging up to 30-50% (do not charge the battery!)|Withdrawal SIM-memory-cards|Photographing the location of screws and plumes|Preparation of the workplace (good lighting, no dust)|Checking the new battery with a multimeter (optional)-->
Step-by-step: how to disassemble Xiaomi Redmi 4 and replace the battery
The replacement process consists of 5 steps: disassembling the body, disabling the plumes, removing the old battery, installing the new one and assembly. Follow the instructions strictly in order to avoid damaging the components.
Step 1: Turn off the phone and remove the back cover
1. Turn off Redmi 4 and remove the tray for SIM-map.
2. Heat the back cover around the perimeter with a hair dryer (1-2 minutes), the glue will become softer and it will be easier to tamper with.
3. Insert a plastic blade into the gap between the lid and the body (start at the lower left corner where the antenna lines are). Carefully drive the blade along the edge, snapping the latches.
⚠️ Don't force it! If the lid doesn't respond, warm it up again with a hair dryer. Too much pressure can break the latches.
Step 2: Unscrewing screws and disconnecting plumes
1. Unscrew all screws (them) ~15 pieces) and put them in order (like a magnetic mat). Redmi 4 has screws of different lengths, don't mix them up!
2. Gently disconnect the plumes:
- Battery (black connector with red and black wires).
- Display (white connector under a metal cover).
Cameras and power buttons (small connectors on the right).
📸 Take a picture of the plumes before disconnecting, and this will help you avoid confusing them when you assemble them.
Step 3: Remove the old battery
1. Put a plastic blade on the battery from any angle. If it's glued hard, warm up with a hair dryer (maximum 80)°C!).
2. Pull by special "ears" (if any) or gently poke around the perimeter. Don't bend the battery! Lithium-ion cells can ignite when deformed.
3 Remove the residues of the glue from the body with alcohol or solvent.
⚠️ Warning: If the battery is swelling, don't try to puncture or bend it. Take it outside and dispose of it at a special reception point (in electronics stores or in hazardous waste dumps).
Step 4: Installation of a new battery
1. Check the contacts of the new battery, which should match the old ones. Clean them with alcohol if necessary.
2. glue double-sided tape or tape to the back of the battery (if there is no glue in the kit).
3. Connect the battery plume to the motherboard and put it neatly back in place. Make sure it lies flat, without skewing.
Step 5: Assembly of the phone
1. Connect all the plumes in reverse order (first buttons, then display, then battery).
2. Twirl the screws, starting with the longest. Don't pull - you can rip the thread!
3. Press the back cover and warm up the edge hair dryer (so that the glue is better grasped).
💡
The most common build error is the wrong connection of the display plume. If the screen doesn't work after you've replaced it, check if the connector is tightly inserted.
5 Possible problems after replacement and how to solve them
Even if you do everything according to the instructions, after replacing the battery, you can have problems.
| Problem. | Possible cause | Decision |
|---|---|---|
| Phone's off. | Unconnected battery plume or display | Take the phone apart and check all the connectors. Try charging for 10 to 15 minutes. |
| Fast discharge of the new battery | Battery Marriage or Uncalibrated Controller | Completely discharge and charge the phone 2-3 times. If it doesn't work, replace the battery. |
| The phone is warming up more than usual | Poor battery contact or high processor load | Check if the battery fits tightly. Close the background applications. |
| Charging is slow. | Poor quality cable/charging or downed settings | Try another RAM. Turn on the settings. → Additionally. → Fast charging. |
| The screen is flashing or not working | The display plume is damaged during assembly | Take the phone apart and check the integrity of the plume, replace it if necessary. |
🔧 If the phone is not turned on after replacement:
- Check if the battery plume is connected.
- Make sure that the battery does not “short” (check with a multimeter – the voltage should be 3.7-4.2 V).
- Connect your phone to charge for 10-15 minutes, then try to turn it on.
- If nothing helps - perhaps damaged motherboard (needs diagnosis in the service).
What if a new battery blows up in a month?
6. How to prolong the life of a new battery: 7 rules of operation
To make the new battery last longer, follow these guidelines:
- 🔌 Charging: Use only high-quality ROMs with parameters 5V/2A. Avoid “fast” charging on the 18–20 Watts -- they shorten their service life.
- 📉 Charge level: try to keep the battery in the range of 20-80%, full discharge and charge up to 100% accelerate degradation.
- 🌡️ Temperature: Do not leave your phone in the sun or near heat sources. The optimum temperature is 10-35.°C.
- 🔄 Calibration: once every 2-3 months completely discharge and charge the phone to reset the controller data.
- 🚫 Background processes: Close unused applications (especially instant messengers and games) that drain the battery even when you are in standby mode.
- 🌙 Power saving mode: turn it on at low charge (Settings) → Battery → Energy saving regime).
- 🔋 Storage: If the phone is lying unused, charge it to 50% and turn it off.
📊 Battery life when properly operated:
- Original/quality: 3-4 years (600-800 cycles)
- Cheap analogue: 1-2 years (300-400 cycles).
💡
Install the GSam Battery Monitor app to track voracious applications, and it will show you which processes drain the battery the fastest.
7. Alternative methods: can the old battery be restored?
If you're not willing to spend money on a new battery, you can try to reanimate the old one, but these methods do have a temporary effect and do not replace a full replacement.
Method 1: Calibration of the charge controller
Sometimes the system misrepresents the charge level due to a controller failure, to reset the data:
- Completely discharge the phone before turning off.
- Connect to charging and wait 100% (do not turn on!).
- Turn off the charging, turn on the phone and again discharge to 0%.
- Repeat the cycle 2-3 times.
Method 2: Replace the controller (for advanced)
If the battery itself is normal, but the phone does not see it, the problem may be in the chip of the charge controller (located on the motherboard (~1 000–1 500 ₽), But without rationing experience, it's better not to risk it.
Method 3: Use of an external battery
If the battery is at least 1-2 hours, but its replacement is impossible, use power bank. for example, Xiaomi Power Bank 3 (20,000 mAh) will allow you to extend the autonomy for a day.
⚠️ Attention: Resuscitation techniques like freezing the battery or applying high voltage are dangerous, they can lead to a fire or explosion.